Hi friends,

What is main difference between hub, switch and router?

In which layer do these devices operate?

Thanks for your help.

Hello, 

I have Netgear WNR 2000, cable router  for VOIP. I constantly get cut off, from speech transmission problems. WNR2000 has no ` DISABLE SIP ALG option, that will help me solve any previous problems on earlier routers. 

I need to fix this problem because I'm talking to clients everyday and  I don't want to give them a bad impression. In  the meantime, I am using my landline to communicate with them. This was working perfectly for a year and I can't figure out how to correct this problem. 

Any help will be greatly appreciated.

Thank you so much.

Hey Everyone,

I was wondering if you can help me with a problem. My office is using a PBX phone system from Panasonic and although it's working just fine, my boss thinks that it's not exactly suitable for the office anymore. We're looking for alternatives, for a new PBX system; when one of my colleagues mentioned about IP Phones from Cisco. The problem is, I have never used an IP Phones before. So I kind of lost on the system.

Hi All,

What is advantage of OSI protocol over TCP? Please give me some details. Regards.

What is the difference between Analog and Digital communication? Please explain.